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Precise measurement of solar magnetic fields with UV scattering polarization

Research Project

Project/Area Number 19K14771
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 16010:Astronomy-related
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

Ishikawa Ryohko  国立天文台, 太陽観測科学プロジェクト, 准教授 (00709636)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Discontinued (Fiscal Year 2021)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords太陽物理学 / 天文 / 紫外線 / 偏光 / プラズマ・核融合
Outline of Research at the Start

6,000度の太陽表面(光球)の上空になぜ100万度のコロナが広がっているのか?太陽表面とコロナの間には、彩層・遷移層と呼ばれる大気層が存在し、そこで起こる磁気流体現象がコロナの加熱に寄与しているのではないかと考えられている。紫外線の偏光スペクトルは、地上観測では得られない彩層上部・遷移層の磁場情報をもたらすと期待されており、その有用性の検証を目指して開発されたのが観測ロケット実験CLASP (2015年打ち上げ)、CLASP2 (2019年打ち上げ予定)である。本研究は、これらの観測ロケット実験から得られる偏光スペクトルを詳細に解析し、彩層上部・遷移層の磁場情報を世界で初めて得ることを目指す。

Outline of Final Research Achievements

Why does a million-degree corona exist above a 6,000-degree photosphere? The key is thought to be the atmospheric layer called the chromosphere, which is located between the photosphere and the corona and where various magnetohydrodynamic phenomena occur. The polarization spectrum in ultraviolet (UV) light is expected to be able to measure the magnetic field of the upper chromosphere, which cannot be obtained by ground-based observations. The sounding rocket experiments CLASP (launched in 2015) and CLASP2 (launched in 2019) were developed to verify the usefulness of the UV polarization spectra. By analyzing data across the Mg II h & k lines around 280 nm obtained by CLASP2, our study clarifies the magnetic field lines leading from the photosphere to the top of the chromosphere, and demonstrates once again the usefulness of the UV polarization spectrum.

Academic Significance and Societal Importance of the Research Achievements

本研究成果をもとに新たな観測ロケット実験CLASP2.1が立ち上がり、2021年秋に観測が実施された。また、次期太陽観測衛星Solar-C EUVSTの次の計画や海外の将来ミッションとして、紫外線の偏光分光観測を用いた宇宙から磁場を計測する太陽ミッションの検討が進められている。本研究成果は、これらの将来計画の検討を加速させることは明らかである。さらに、太陽フレアやコロナ質量放出など、太陽の活動現象は、我々の生活と密接な関わりを持っている。紫外線の偏光分光観測による磁場測定が定常的に実施されるようになれば、これらの活動現象の理解を大きく進展させることができる。

Report

(3 results)
  • 2021 Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Research-status Report
  • Research Products

    (21 results)

All 2021 2020 2019 Other

All Int'l Joint Research (4 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 7 results,  Invited: 5 results) Remarks (5 results)

  • [Int'l Joint Research] Instituto de Astrofisica de Canarias(スペイン)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] NASA/MSFC(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Instituto de Astrofisica de Canarias(スペイン)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] NASA/MSFC(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Mapping solar magnetic fields from the photosphere to the base of the corona2021

    • Author(s)
      R. Ishikawa, J. Trujillo Bueno, T. del Pino Aleman, T. J. Okamoto, D. E. McKenzie, F. Auchere, R. Kano, D. Song, M. Yoshida, L. A. Rachmeler, K. Kobayashi, H. Hara, M. Kubo, N. Narukage, T. Sakao, T. Shimizu, Y. Suematsu, C. Bethge, B. De Pontieu, A. Sainz Dalda, D. V. Genevieve, A. Winebarger et al.
    • Journal Title

      Science Advances

      Volume: 7 Issue: 8 Pages: 8-8

    • DOI

      10.1126/sciadv.abe8406

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] UV Spectro-Polarimetry in the Solar Atmosphere -- Results from Two Sounding Rocket Experiments CLASP1 and CLASP22021

    • Author(s)
      Joten Okamoto, R. Ishikawa, D. E. McKenzie, J. Trujillo Bueno, R. Kano, A. R. Winebarger, F. Auchere, L. A. Rachmeler, D. Song, N. Narukage, C. Bethge, K. Kobayashi, M. Yoshida, M. Kubo, S. Ishikawa, Y. Katsukawa, T. Bando, G. Giono, T. del Pino Aleman
    • Organizer
      IAU Symposium 360 Astronomical Polarimetry 2020 New Era of Multi-Wavelength Polarimetry
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] CLASP2 first results: mapping of solar magnetic fields from the photosphere to the top of the chromosphere2021

    • Author(s)
      Ryohko Ishikawa
    • Organizer
      SDO 2021 Science Workshop
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 観測ロケット実験CLASP2・ひので衛星による太陽磁場の断層診断2021

    • Author(s)
      石川遼子, 岡本丈典, D. McKenzie, J. Trujillo Bueno, 鹿野良平, D. Song, 吉田正樹, L. Rachmeler, F. Auchere, 浦口史寛, 久保雅仁, 坂尾太郎, 篠田一也, 清水敏文, 末松芳法, 都築俊宏, 成影典之, 納富良文, 原弘久, A. Winebarger, K. Kobayashi, 以下10名
    • Organizer
      宇宙科学シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] Chromospheric Studies Based on CLASP Series: A New Challenge for CLASP2.12020

    • Author(s)
      Donguk Song, Ryohko Ishikawa, Takenori Joten Okamoto, Ryouhel Kano, David E. McKenzie, Javier Trujillo Bueno, Frederic Auchere, Laurel Rachmeler, Ken Kobayashi, Christian Bethge, and CLASP2 and CLASP2.1 teams
    • Organizer
      2020年度太陽研連・太陽スペース研究シンポジウム
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Tomography of plage and network magnetic fields from Hinode and CLASP2 observations2020

    • Author(s)
      R. Ishikawa, J. Trujillo Bueno, T. del Pino Aleman, T. J. Okamoto, R. Kano, D. Song, M. Yoshida, D. E. McKenzie, K. Kobayashi, F. Auchere, L. Rachmeler, C. Bethge, CLASP2 team
    • Organizer
      日本天文学会2020年秋季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Initial results from CLASP2 rocket experiment to measure magnetic fields in the solar chromosphere2020

    • Author(s)
      Joten Okamoto, Ryoko Ishikawa, David McKenzie, Javier Trujillo Bueno, Frederic Auchere, Laurel Rachmeler, Ryohei Kano, Donguk Song, Christian Bethge, Ken Kobayashi, Masaki Yoshida, Tanausu del Pino Aleman, CLASP2 team
    • Organizer
      JpGU - AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The Chromospheric Layer SpectroPolarimeter (CLASP2) Mission: Introduction2020

    • Author(s)
      David E. McKenzie, Ryohko Ishikawa, Ryouhei Kano, Joten Okamoto, Laurel Rachmeler, Javier Trujillo Bueno, Frederic Auchere, Ken Kobayashi, Donguk Song, Masaki Yoshida
    • Organizer
      JpGU - AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The CLASP and CLASP2 missions2019

    • Author(s)
      Ryohko Ishikawa, Ryouhei Kano, Amy Winebarger, David McKenzie, Javier Trujillo Bueno, Frederic Auchere, Noriyuki Narukage, Takamasa Bando, Ken Kobayashi, Laurel Rachmeler, Donguk Song, Masaki Yoshida, Takenori J. Okamoto, and the CLASP and CLASP2 team
    • Organizer
      Solar Polarization Workshop 9
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] First results of the Chromospheric LAyer Spectro-Polarimeter (CLASP2)2019

    • Author(s)
      Ryohko Ishikawa, David E. McKenzie, Javier Trujillo Bueno, Frederic Auchere, Ryouhei Kano, Donguk Song, Masaki Yoshida, Toshihiro Tsuzuki, Fumihiro Uraguchi, Takenori Okamoto, Laurel Rachmeler, Ken Kobayashi, CLASP2 Team
    • Organizer
      Hinode-13/IPELS 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 紫外線偏光分光観測実験CLASPシリーズから得る将来計画への示唆2019

    • Author(s)
      石川遼子
    • Organizer
      日本天文学会2019年秋季年会
    • Related Report
      2019 Research-status Report
  • [Presentation] Observational results for the plage target2019

    • Author(s)
      Ryohko Ishikawa
    • Organizer
      CLASP2 Science Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] 太陽表面からコロナ直下に迫る―太陽観測ロケット実験CLASP2が測定した太陽大気の磁場

    • URL

      https://www.nao.ac.jp/news/science/2021/20210220-clasp2.html

    • Related Report
      2020 Annual Research Report
  • [Remarks] 太陽表面からコロナ直下に迫る―太陽観測ロケット実験CLASP2が測定した太陽大気の磁場

    • URL

      https://hinode.nao.ac.jp/news/results/clasp2-publication-202102/

    • Related Report
      2020 Annual Research Report
  • [Remarks] CLASP2 Elucidates Solar Magnetic Field

    • URL

      https://www.nao.ac.jp/en/news/science/2021/20210220-clasp2.html

    • Related Report
      2020 Annual Research Report
  • [Remarks] CLASP2 Elucidates Solar Magnetic Field

    • URL

      https://hinode.nao.ac.jp/en/news/results/clasp2-publication-en-202102/

    • Related Report
      2020 Annual Research Report
  • [Remarks] CLASP2Webページ

    • URL

      https://solarwww.mtk.nao.ac.jp/Rocket_balloon_experiments/CLASP2/index_j.html

    • Related Report
      2020 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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